Tandem tip-joined rotor blade and hub coupling for passive pitch angle control
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F03D-001/06
F03D-013/20
F03D-007/02
출원번호
US-0213429
(2016-07-19)
등록번호
US-10208733
(2019-02-19)
발명자
/ 주소
Barrows, Michael L
출원인 / 주소
Barrows, Michael L
대리인 / 주소
Van Bergen, Peter J.
인용정보
피인용 횟수 :
0인용 특허 :
11
초록▼
A rotor blade system includes a hub for rotational movement in a defined direction of rotation. A first airfoil having a quarter-chord defined along a span thereof is coupled to the hub, but is uncoupled from the rotational movement of the hub. A second airfoil having a quarter-chord defined along a
A rotor blade system includes a hub for rotational movement in a defined direction of rotation. A first airfoil having a quarter-chord defined along a span thereof is coupled to the hub, but is uncoupled from the rotational movement of the hub. A second airfoil having a quarter-chord defined along a span thereof is coupled to the hub for rotation in direct correspondence with the rotational movement of the hub. The quarter-chord of the first airfoil leads the quarter-chord of the second airfoil when the hub experiences its rotational movement in the defined direction of rotation. A connector couples the tip of the first airfoil to the tip of the second airfoil.
대표청구항▼
1. A rotor blade system, comprising: a hub for rotational movement in a defined direction of rotation;a first airfoil having a quarter-chord defined along a span of said first airfoil, said first airfoil coupled to said hub but uncoupled from said rotational movement of said hub, said first airfoil
1. A rotor blade system, comprising: a hub for rotational movement in a defined direction of rotation;a first airfoil having a quarter-chord defined along a span of said first airfoil, said first airfoil coupled to said hub but uncoupled from said rotational movement of said hub, said first airfoil having a tip;a second airfoil having a quarter-chord defined along a span of said second airfoil, said second airfoil coupled to said hub for rotation in direct correspondence with said rotational movement of said hub, said quarter-chord of said first airfoil leading said quarter-chord of said second airfoil when said hub experiences said rotational movement in said defined direction of rotation, said second airfoil having a tip; anda connector for coupling said tip of said first airfoil to said tip of said second airfoil. 2. A rotor blade system as in claim 1, further comprising a tower adapted to be fixed to a ground surface, wherein said hub is coupled to said tower, and wherein said defined direction of rotation is approximately perpendicular to the ground surface. 3. A rotor blade system as in claim 1, wherein said connector comprises a third airfoil. 4. A rotor blade system as in claim 1, wherein at least one of said first airfoil and said second airfoil includes a mounting portion for coupling to said hub, wherein each said mounting portion contributes to an airfoil offset defining an amount by which said quarter-chord of said first airfoil leads said quarter-chord of said second airfoil. 5. A rotor blade system as in claim 1, wherein said hub includes a mounting portion for coupling to said first airfoil and said second airfoil, wherein said mounting portion contributes to an airfoil offset defining an amount by which said quarter-chord of said first airfoil leads said quarter-chord of said second airfoil. 6. A rotor blade system, comprising: a hub for rotational movement in a defined direction of rotation; anda plurality of rotor blades, each of said rotor blades includinga first airfoil having a quarter-chord defined along a span of said first airfoil, said first airfoil coupled to said hub but uncoupled from said rotational movement of said hub, said first airfoil having a tip,a second airfoil having a quarter-chord, said second airfoil coupled to said hub for rotation in direct correspondence to said rotational movement of said hub, said quarter-chord of said first airfoil leading said quarter-chord of said second airfoil when said hub experiences said rotational movement in said defined direction of rotation, said second airfoil having a tip, anda connector for coupling said tip of said first airfoil to said tip of said second airfoil. 7. A rotor blade system as in claim 6, wherein said rotor blades are evenly distributed about said hub. 8. A rotor blade system as in claim 6, further comprising a tower adapted to be fixed to a ground surface, wherein said hub is coupled to said tower, and wherein said defined direction of rotation is approximately perpendicular to the ground surface. 9. A rotor blade system as in claim 6, wherein each said connector comprises a third airfoil. 10. A rotor blade system as in claim 6 wherein, for each of said rotor blades, at least one of said first airfoil and said second airfoil includes a mounting portion for coupling to said hub, wherein each said mounting portion contributes to an airfoil offset defining an amount by which said quarter-chord of said first airfoil leads said quarter-chord of said second airfoil. 11. A rotor blade system as in claim 6, wherein said hub includes a mounting portion for coupling to said first airfoil and said second airfoil associated with each of said rotor blades, wherein said mounting portion contributes to an airfoil offset defining an amount by which said quarter-chord of said first airfoil leads said quarter-chord of said second airfoil for each of said rotor blades. 12. A rotor blade system for operation above a ground surface, comprising: a hub for rotational movement in a defined direction of rotation and in a plane approximately perpendicular to the ground surface; anda plurality of rotor blades, each of said rotor blades includinga first airfoil having a quarter-chord defined along a span of said first airfoil, said first airfoil coupled to said hub but uncoupled from said rotational movement of said hub, said first airfoil having a tip,a second airfoil having a quarter-chord, said second airfoil coupled to said hub for rotation in direct correspondence to said rotational movement of said hub, said quarter-chord of said first airfoil leading said quarter-chord of said second airfoil when said hub experiences said rotational movement in said defined direction of rotation, said second airfoil having a tip, anda connector for coupling said tip of said first airfoil to said tip of said second airfoil. 13. A rotor blade system as in claim 12, wherein said rotor blades are evenly distributed about said hub. 14. A rotor blade system as in claim 12, further comprising a tower adapted to be fixed to the ground surface, said hub being mounted on said tower. 15. A rotor blade system as in claim 12, wherein each said connector comprises a third airfoil. 16. A rotor blade system as in claim 12 wherein, for each of said rotor blades, at least one of said first airfoil and said second airfoil includes a mounting portion for coupling to said hub, wherein each said mounting portion contributes to an airfoil offset defining an amount by which said quarter-chord of said first airfoil leads said quarter-chord of said second airfoil. 17. A rotor blade system as in claim 12, wherein said hub includes a mounting portion for coupling to said first airfoil and said second airfoil associated with each of said rotor blades, wherein said mounting portion contributes to an airfoil offset defining an amount by which said quarter-chord of said first airfoil leads said quarter-chord of said second airfoil for each of said rotor blades.
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이 특허에 인용된 특허 (11)
Giguere, Philippe; Herr, Stefan; Fritz, Peter James; Riddell, Scott Gabell; Bergman, Jeffrey Eric, Extension for rotor blade in wind turbine.
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